Steam-generator.



0. SUMNER.

STEAM GENERATOR.

APPLICATION FILED NOV. 13, 1912.

1,109,483, Patented Sept. 1, 1914.

2 SHEETS-SHEBT z.

H- i P h W h L E El 1s 13' UNITED STATES. PATENT OFFICE STEAM- GENERATOR I Specification of Letters Patent.

Patented Sept. 1, 1914.

Application filed November 18, 1912. Serial No. 732,109.

To all whom it may concern:

Be it known that I, ORLANDO SUMNER, a citizen of the United Kingdom of Great Britain and Ireland, and resident of 39 Victoria street, \Vestminster, London, England, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification, such as will enable others skilled in the art to which it appertains to make and use-the same.

My invention has for its object "to provide a completely self-contained steam generator which while receiving cold food water can economically deliver dry or superheated steam without the assistance of extraneous economizers and superheaters, and more particularly has for its object to use a single steam and water drum andto provide an economizer or feed-water heater and chamber which form integral parts of the generator and are adaptable to watertube boilers.

The effect of introducing comparatively cool feed-water into a generator under steam isto locally reduce the temperature of the water in process of evaporation and to condense certain of the steam generated, to overcome which the feed-water has hitherto generally been previously heated by extraneouseconomizers or feed-water heaters, which are either of great bulk and proportionate cost or absorb a considerable amount of the heat units required for steam raising.

In my invention the economizer forms an integral part of the generator and is so devised that the waste gases may be tra ped before they enter the uptake and the" eedwater thereby heated in a more economical manner than has hitherto been possible.

The triangular disposition of the three banks of tubes in m generator affords a suitable position for t e lntegral economizer" chamber between these banks of tubes, and as the aperture affording communication between this economizer chamber and the combustion chamber is' disposed opposite to the outlet for the waste gases into the flue or uptake, it follows that there is no absorption by the economizer tubes of the heat required for steam raising, while the position of the economizer chamber assures that 'within itthere is a greater heat than is available for feed-water heatingjin the uptake or flue; and this higher temperature in the economizer chamber assures the feedwater "heating tubes inside it being immune from the heavy soot and tarry deposits common to the use of any extraneous economizer, which it is known only begin to form at a temperature of about 600 Fahr. and increase as the temperature of the waste gases decreases. The employment of feedwater heating tubes in any part of a combustion chamber other than in the manner described in my inventionobviously absorbs a large proportion of the heat units which would be better employed in steam ralsmg.

The objections referred to are entirely overcome in my invention as will be seen from the following description and accompanying drawings forming a part of this specification, in which similar numbers of reference indicate like parts in both drawmgs.

Figures 1 and 2-are respectively a side sectional elevation and a front sectional elevation showing one of the forms in which the integral economizer may be conveniently employed without interference with the existing arrangements of the Water-tubes and drums, the drawings showing it applied to my 3-drum generator. The baflle plates 1, 2 and 3 deflecting the furnace gases from the furnace to the uptake are of equal width with the combustion chamber, and by their .disposition constitute walls forming the economizer chamber 4 and substantially envelopingthe economizer tubes 5 which are transversely chamber 6. The lower extremity of the baflle plate 3,is shortened to provide the economizer chamber opening? which is situated immediately opposite the outlet 8 through which the products of combustion pass from the combustion chamber. The products of combustion sweep around the outside of the economizer chamber walls 1, 2 and 3 in the order named and are thus effectually prevented from contact with the economizer tubes until they are-no longer required for steam raising, as the position of the aperture 7assures that the economizer chamber receives only waste gases at a temperature in excess of that in the uptake or flue.

As shown in the accompanying drawings the economizer chamber is in the nature of a waste heat reservoir having any suitable outlet such as the outlets 25 which extend.

from the sides of the economizer chamber and lead to and communicate with the disposed across the combustion,

smoke uptake. Feed-water enters the integral economizer at the bottom 9 and leaves it at the top 10, passing through the pipe 11 i I in the fixed chocks on the frames 21, the

water drum 16 is carried through the combustion chamber and supported in sliding checks which permit it to move freely under the influences of expansion and contraction only on the frames 23, and the mud drum 14 is suspended entirely by tubes from drums 12 and 16. To provide eflicient anchoring of the generator in its frames for marine use, drums 12, and 16 are provided with circumferential straps 24: in contact with the inner sides of their respective chocks, while the mud drum 14: has at either end stoppers in contact with the frames which are not shown in the'accompanying drawings. These provisions effectually prevent any undesirable movement of the generator fproper while the general arrangement a ords unusually ample provision for expansion and contraction.

It is apparent that by extending or contracting the distances between the drums the amount of heating surface in the respec tive banks of tubes may be correctly propor tioned to the heat value of the hot gases be? tween the furnace and the uptake. It is equally obvious that a boiler of this general design must have a perfect circulation, one that is positive, rapid, uniform, and certain in action locally as well as generally,

obviating deposit or scale in improper places and permitting the use of feed-water highly charged with mineral salts in solution or purities without risk or damage from deposit.

The accompanying drawings show the enerator fired from the front, but it may also be fired from either side and from the ack.

What I claim and desire-to secure by Letters Patent is 1. In combination with a furnace and the combustion chamber thereof, a steam generator comprising drums, tubes connecting the drums, an economizer supported between the drums, means for substantially housing the economizer, sa1d means havlng an opening for admitting products of combustion to the economizer.

2. In combination with a furnace and the combustion chamber thereof, a steam generator comprising drums, an economizer associated withthe drums, baflle plates substantially housing the economizer, said baffle plates being arranged to provide an opening, said opening adapted to admit products of combustion to the economizer substantially as described.

3. In combination with a furnace, a steam generator comprising drums, water tubes connecting the drums, an economizer chamber supported between the drums, an economizer supported in the chamber, said chamber having an opening arranged within the outlet of the furnace to admit products of combustion to the economizer for heating water held thereby.

' 4. In combination with a furnace and the combustion chamber thereof, a steam generator comprising drums, tubes connecting the drums, an economizer supported between the drums, means for substantially housing the economizer, said means having an opening for admitting products of combustion to the economizer, means of com-. munication between the economizer cham- 

